Display screen or portion thereof with a graphical user interface for a surgical instrument



FIG. 1 is a front view of a display screen or portion thereof with agraphical user interface for a surgical instrument; and,

FIG. 2 is a front view of a second embodiment of a display screen orportion thereof with a graphical user interface for a surgicalinstrument.

The evenly spaced broken lines illustrate a display screen or portionthereof and form no part of the claimed design. The dash-dot brokenlines illustrate the boundary of the claimed design and form no partthereof. The dash-dash broken lines within the boundary illustrateportions of the graphical user interface and form no part of the claimeddesign.

CLAIM The ornamental design for a display screen or portion thereof witha graphical user interface for a surgical instrument, as shown anddescribed.